Secondly, in the case that it is difficult or difficult to identify, there are many ways to open the door, and different brands reserve different emergency unlocking methods.
Leaving a keyhole is a common solution.
In addition, there are many, such as unlocking the door card, which is the same as many hotels in previous years.
There are also numbers or pattern passwords to unlock, just like some mobile phones.
There is also a smarter Bluetooth unlock for mobile phones, which, like many weighing scale now, connects mobile phone applets with one click.